Which organs secrete oestrogen and progesterone?

The ovaries are the organs responsible for secreting oestrogen and progesterone, which are key hormones in the female reproductive system. Oestrogen plays a crucial role in regulating the menstrual cycle, facilitating the development of secondary sexual characteristics, and promoting the thickening of the endometrium in preparation for potential pregnancy. Progesterone, mainly produced after ovulation, is essential for maintaining the uterine lining for implantation of a fertilized egg and ensuring the early stages of pregnancy.

The other organs listed do not produce these hormones. The testis is involved in the production of testosterone, which is important for male reproductive functions. The uterus is primarily a site for implantation and fetal development rather than hormone secretion. The oviducts (or fallopian tubes) are the conduits for egg transport from the ovaries to the uterus and do not have a role in hormone production. Therefore, the ovaries are the correct choice as they are the primary source of oestrogen and progesterone in females.